CVE-2026-90799

Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint. The use of prefixed system databases is very rare. Users are recommended to upgrade to version 3.5.3, which fixes this issue.

A missing circuit-breaker in the replicator in Apache CouchDB 3.5.2 and below on all platforms allows the owner of a replication source or target to cause a denial of service via creating an infinite HTTP redirect loop. Users are recommended to upgrade to version 3.5.3, which fixes this issue.

Apache CouchDB 3.5.2 and below contains an unlimited gzip decompression routine in chttpd. Any remote client can cause a denial of service via memory exhaustion.

Apache CouchDB 3.5.2 and below insufficiently filters credentials in the _replicator database. An authenticated user can read replication credentials of other users' replications, not just their own.

CouchDB administrative users can configure the database server via HTTP(S), allowing them to specify paths for operating system-level binaries. This enables the CouchDB user to execute arbitrary shell commands, including downloading and executing scripts from the public internet.

An unvalidated runtime configuration value in Apache CouchDB 3.5.2 and below on all platforms allows a CouchDB server admin to run arbitrary shell commands as the CouchDB operating system user.

In Apache CouchDB before version 1.7.0 and 2.x before version 2.1.1, a vulnerability allows submitting _users documents with duplicate 'roles' keys, which can lead to non-admin users being granted admin privileges.